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135B20 — DIAPHRAGM,ACTUATOR VALVE,SPECIAL

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

135B20: DIAPHRAGM,ACTUATOR VALVE,SPECIAL.

DIAPHRAGM,ACTUATOR VALVE,SPECIAL. Key specifications include material: RUBBER SYNTHETIC, hole_diameter: 0.250 INCHES NOMINAL IN, outside_diameter: 3.500 INCHES NOMINAL IN, style_designator: SPECIAL SHAPED, material_thickness: 0.070 INCHES NOMINAL IN, bolt_circle_diameter: 3.062 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 4820-00-015-3201, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
135B20
NSN: 4820-00-015-3201
FSC: 4820 — Valves, Nonpowered
CAGE: 79227 — WATTS REGULATOR COMPANY (USA)
SPECIFICATIONS
materialRUBBER SYNTHETIC
hole_diameter0.250 INCHES NOMINAL IN
outside_diameter3.500 INCHES NOMINAL IN
style_designatorSPECIAL SHAPED
bolt_hole_quantity6
material_thickness0.070 INCHES NOMINAL IN
bolt_circle_diameter3.062 INCHES NOMINAL IN
center_hole_diameter0.375 INCHES NOMINAL IN
supplementary_featuresFABRIC REINFORCED
NSN4820-00-015-3201
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 135B20 · OEM ⚠ VERIFY BEFORE ORDERING Gate valves = FULL OPEN or FULL CLOSE only — never throttle. Partial opening causes seat erosion and vibration. ✓ BROKER TIP Rising stem shows valve position visually — easier maintenance. Non-rising stem saves headroom. PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
OUTSIDE DIAMETER: 3.500 INCHES NOMINAL IN
•
SUPPLEMENTARY FEATURES: FABRIC REINFORCED
•
STYLE DESIGNATOR: SPECIAL SHAPED
•
MATERIAL THICKNESS: 0.070 INCHES NOMINAL IN
•
BOLT HOLE QUANTITY: 6
•
BOLT CIRCLE DIAMETER: 3.062 INCHES NOMINAL IN
•
CENTER HOLE DIAMETER: 0.375 INCHES NOMINAL IN
•
MATERIAL: RUBBER SYNTHETIC
TECHNICAL CHARACTERISTICS
OUTSIDE DIAMETER3.500 INCHES NOMINAL IN
SUPPLEMENTARY FEATURESFABRIC REINFORCED
STYLE DESIGNATORSPECIAL SHAPED
MATERIAL THICKNESS0.070 INCHES NOMINAL IN
BOLT HOLE QUANTITY6
BOLT CIRCLE DIAMETER3.062 INCHES NOMINAL IN
CENTER HOLE DIAMETER0.375 INCHES NOMINAL IN
MATERIALRUBBER SYNTHETIC
HOLE DIAMETER0.250 INCHES NOMINAL IN
OTHER ITEMS IN FSC 4820 — Valves, Nonpowered
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4820-00-000-0097 4820-00-001-0010 4820-00-001-0020 4820-00-001-0021 4820-00-001-0032 4820-00-001-0037 4820-00-001-0042 4820-00-001-1230
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 135B20?
135B20 is a DIAPHRAGM,ACTUATOR VALVE,SPECIAL.
What is the NSN for 135B20?
135B20 is cataloged in the U.S. Government catalog under NSN 4820-00-015-3201. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.